<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <button @click="fn1">点击1</button>
        <button @click="fn2($event)">点击2</button>
        <button @click="fn3($event,2)">点击3</button>
    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el:"#app",
            data() {
                return {}
            },
            methods:{
                fn1(event) {
                    console.log(event, "fn1");
                },
                fn2(event) {
                    console.log(event, "fn2");
                },
                fn3(event) {
                    console.log(event, "fn3");
                }
            }
        })
    </script>
</body>
</html>